将一小块镁条和铝箔分别放在酒精灯上加热至熔化，下列实验现象描述正确的是[ ] A

某汽车制造厂2000年1月份生产汽车25000辆，若3月份产量要达到30250辆，则这两个月的平均增长率为（    ）。

阅读下面的短文，在标有序号的空白处填入一个适当的词，或填入括号中单词的正确形式，并将序号及相应答案写在答题纸上。

In all one’s lifetime it is oneself that one spends the most time being with or dealing with. But it is precisely(精确地) oneself that one has the  ①  understanding of. When you are going upwards in life you tend to overestimate(高估) yourself. It seems that everything you seek for is within your reach. When you are going downhill you tend to underestimate yourself,  ② (mistake) difficulties for your own inability.

To get a thorough understanding of oneself is to gain a correct view of oneself and be a realist --- aware of   ③  one’s strength and shortage. You may look ④  hopefully to the future but be sure not to expect too much, for details can never be fully realized. You may be courageous to meet challenges but it should be clear to you where to direct your efforts.

To get a thorough understanding of oneself requires doing oneself a favor when it    ⑤ (need). In time of anger, do yourself a favor by giving vent(出路，出口) to it in a quiet place so that you won’t be hurt by its flames; in time of  ⑥  , do yourself a favor by sharing it with your friends so as to  ⑦  a sad mood into a cheerful one; in time of tiredness, do yourself a favor by getting a  ⑧  sleep. Care about your health and daily life.   ⑨  you know perfectly well when and how to do yourself a favor, you won’t be confident and ready enough to resist the attack of illness.

To get a thorough understanding of oneself is to get a full control of one’s life. Then one will find one’s life full of   ⑩  .

证券内幕消息的知情人包括持有公司( )以上股份的自然人、法人、其他组织。

A．5%

B．10%

C．15%

D．20%

HF面板上的CP,RT,CT故障指示灯分别指示的是什么故障（）

A、控制面板,收发机，偶合器

B、控制面板，偶合器,收发机

C、收发机，偶合器，控制面板

D、偶合器，收发机，控制面板

行驶系由（）；（）、悬架和车轮等部分组成。